Daily or binge?
If daily:
Start with what she normally drinks. Decrease by one each day until you go your first full day without a drink. Have one every other day. Keeps the tremors away until she can start to really replace with healthier habits.
Don't have her even attempt cold turkey. Depending on how much of an alcoholic she is, that could be fatal.
If she's a binge drinker:
She needs to stop at half what she would normally drink next time. Then half that, on the next binge, and so on.
You can recover from severe alcoholism, but it takes a great deal of discipline, and support. Loving support. Non judgemental, loving support.
Prayers, anon.